.\"
.\" This file and its contents are supplied under the terms of the
.\" Common Development and Distribution License ("CDDL"), version 1.0.
.\" You may only use this file in accordance with the terms of version
.\" 1.0 of the CDDL.
.\"
.\" A full copy of the text of the CDDL should have accompanied this
.\" source.  A copy of the CDDL is also available via the Internet at
.\" http://www.illumos.org/license/CDDL.
.\"
.\"
.\" Copyright 2015 Joyent, Inc.
.\"
.Dd May 11, 2016
.Dt PADDR_TO_CTF 3PROC
.Os
.Sh NAME
.Nm Paddr_to_ctf ,
.Nm Plmid_to_ctf ,
.Nm Pname_to_ctf
.Nd lookup CTF data
.Sh LIBRARY
.Lb libproc
.Sh SYNOPSIS
.In libproc.h
.Ft "ctf_file_t *"
.Fo Paddr_to_ctf
.Fa "struct ps_prochandle *P"
.Fa "uintptr_t addr"
.Fc
.Ft "ctf_file_t *"
.Fo Plmid_to_ctf
.Fa "struct ps_prochandle *P"
.Fa "Lmid_t lmid"
.Fa "const char *name"
.Fc
.Ft "ctf_file_t *"
.Fo Pname_to_ctf
.Fa "struct ps_prochandle *P"
.Fa "const char *name"
.Fc
.Sh DESCRIPTION
The
.Fn Paddr_to_ctf ,
.Fn Plmid_to_ctf ,
and
.Fn Pname_to_ctf
functions lookup CTF (Compact C Type Format) data, for use with
.Sy libctf ,
from the process represented by the handle
.Fa P .
In all cases, the CTF sections of both the running executable and its
shared libraries are searched.
.Pp
The CTF container returned is valid as long as the process handle
.Fa P
is valid.
That is, until a call to
.Xr Prelease 3PROC
is made.
Further, consumers must not close the CTF container.
.Pp
The
.Fn Paddr_to_ctf
function attempts to find the CTF section, if any, that exists for the
address
.Fa addr .
Note, not all addresses correspond to memory regions that have CTF
data.
For example, if a user creates a region of anonymous memory through the
.Xr mmap 2
function, then it will not have any corresponding CTF information.
.Pp
The
.Fn Pname_to_ctf
function looks up the object named
.Fa name
and returns the corresponding CTF section, if any exists.
Two special values may be used for name.
The macro
.Dv PR_OBJ_EXEC
refers to the executable object itself and the macro
.Dv PR_OBJ_LDSO refers to the object ld.so.1 .
.Pp
The
.Fn Plmid_to_ctf
function is similar to
.Fn Pname_to_ctf .
It allows the passing of a link-map identifier,
.Fa lmid ,
which constricts the search of the object named with
.Fa name
to that link-map.
The special value of
.Dv PR_LMID_EVERY
indicates that every link-map should be searched, which is equivalent
in behavior to the
.Fn Pname_to_ctf
function.
.Sh RETURN VALUES
Upon successful completion, the
.Fn Paddr_to_ctf ,
.Fn Plmid_to_ctf ,
and
.Fn Pname_to_ctf
functions return a pointer to the corresponding CTF container.
Otherwise, if none exists then
.Dv NULL
is returned.
.Sh INTERFACE STABILITY
.Sy Uncommitted
.Sh MT-LEVEL
See
.Sy LOCKING
in
.Xr libproc 3LIB .
.Sh SEE ALSO
.Xr libproc 3LIB ,
.Xr ctf 5
